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Vulnerability Details : CVE-2007-3731

The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial of service (NULL dereference and OOPS) via certain code that makes ptrace PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the TRACE_IRQS_ON function, and possibly related to the arch_ptrace function.
Publish Date : 2007-09-17 Last Update Date : 2010-08-21
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service

- Vendor Statements

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 2.1, 3, or 4.
Source: Redhat

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate 2007-07-16 2007-07-15
If you are a vendor and you have additional data which can be automatically imported into our database, please contact admin @

- Related OVAL Definitions

Title Definition Id Class Family
DSA-1378-1 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities oval:org.mitre.oval:def:20370 unix
DSA-1378-2 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities oval:org.mitre.oval:def:18649 unix
ELSA-2007:0940: kernel security update (Important) oval:org.mitre.oval:def:21736 unix
RHSA-2007:0940: kernel security update (Important) oval:com.redhat.rhsa:def:20070940 unix
The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) durin... oval:org.mitre.oval:def:10394 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2007-3731

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel 2.6.20 Version Details Vulnerabilities
2 OS Linux Linux Kernel 2.6.21 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 2

- References For CVE-2007-3731
BID 25801 Linux Kernel PTrace NULL Pointer Dereference Local Denial Of Service Vulnerability Release Date:2008-02-29
REDHAT RHSA-2007:0940
OSVDB 37286;a=commitdiff;h=a10d9a71bafd3a283da240d2868e71346d2aef6f CONFIRM;a=commitdiff;h=29eb51101c02df517ca64ec472d7501127ad1da8 CONFIRM CONFIRM
BUGTRAQ 20080229 rPSA-2008-0094-1 kernel CONFIRM

- Metasploit Modules Related To CVE-2007-3731

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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